<ol>
  <li>Specify the location of the feature with the mouse or by entering a
  coordinate.</li>
  <li>Specify the location of the text label and end point of the leader. If
  the leader is close to vertical, the X datum is indicated, if it is close to
  horizontal, the Y datum is indicated.</li>
  <li>The origin of the ordinate dimension is at the absolute zero point. To
  move the origin by mouse, select the ordinate dimension entity and move the
  origin with the mouse (drag and drop). To specify a coordinate for the
  origin, use the property editor.</li>
</ol>
